. >>> investigators have taken samples from the remains of long-time palestinian leader yasser arafat. eight years after his death, they are trying to determine if he was poisoned. rita nissan on a search for evidence. >> reporter: palestinian leaders laid wreaths outside the west bank grave of yasser arafat after forensic experts exhumed his body. international investigators took samples from his remains to determine if someone poisoned him. >> but now, we will wait for the evidence. >> reporter: arafat died eight years ago at a hospital in france after an unexplained incident. they blame israel for his death. israel denver it. a murder investigation began after a swiss lab found high levels of a lethal radioactive substance, polonium, on his clothing. scientists said they needed to examine his remains to know more. big blue tarps surround arafat's grave kept prying eyes away as workers drilled through layers of concrete to reach the tomb. some supporters were opposed to disturbing the gravesite, others saying it's necessary to learn the truth. this man says, we have to know why he d